CYP3A Phenotypes and Genotypes in North Indians

Overview

Journal Eur J Clin Pharmacol

Specialty Pharmacology

Date 2006 Jun 8

PMID 16758258

Citations 8

Authors

Naushad Rais

Yogesh K Chawla

Krishan K Kohli

Affiliations

Soon will be listed here.

Abstract

Objectives: To phenotype 200 healthy North Indians for cytochrome P450 3A (CYP3A) activity by measuring urinary ratio of 6beta-OH-cortisol/cortisol (6beta-OH-CS/CS) and to genotype the subjects demonstrating low and high CYP3A activity for the presence of CYP3A4*1B, *2, *4, *5, *6 and *10 alleles.

Methods: Morning spot urine samples were collected from 200 healthy North Indians. CS and 6beta-OH-CS were extracted and quantified by HPLC. Genotyping was performed by polymerase chain reaction (PCR) followed by restriction fragment length polymorphism (RFLP).

Results: Urinary 6beta-OH-CS/CS ratio demonstrated a mean of 52.0 +/- 46 (1.1-290). North Indians demonstrated unimodal distribution with respect to urinary 6beta-OH-CS/CS ratio. On the basis of phenotypes, the subjects were divided into three groups demonstrating low (n = 50), intermediate (n = 100) and high (n = 50) CYP3A activity. These groups demonstrated 6beta-OH-CS/CS ratio of 13.4 +/- 5.2 (1.1-21.0), 40 +/- 11.9 (21.2-63.2) and 114 +/- 51.0 (66-290), respectively. One hundred subjects, 50 in the low and 50 in the high activity group, were genotyped for CYP3A4*1B, *2, *4, *5, *6 and *10. Only 2 heterozygotes with genotype CYP3A4*1/*1B were found in the high CYP3A activity group. CYP3A4*2, *4, *5, *6 and *10 were not found in the subjects studied.

Conclusion: This is the first investigation establishing CYP3A phenotypes and demonstrating the absence of common CYP3A4 genotypes in North Indians.

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